Boxing for drills



m3211923." f 1,449,671.A

J. A. HALLANDER.

- BOXING FUR DBILLS.

man szPLz. 1921,.

Patented Mar. 27, 1923.

JOHNA. EALLANDER, OF OT'I'UMWA, IO'WA, ASSIGNOR TO AMERICAN MINING TOOL COMPANY, OF OTTUMWA, IOWA, A CORPORATION OF IOWA.

BoxING non nnILLs;

Application tiled September 2, 1921. Serial No. 498,170. j

fication, reference being had to the accom-- panying drawing.

Y This invention relates to drilling apparatus of the type commonly employed incoalmines.

Drills of the character mentioned com-` prise a two-part boxing, the two partsk of which are hingedtogether and interiorly screw-threaded so that, when locked together, the usual screw-threaded drill-rod can be movably mounted therein. Upon one end of such boxing is mounted and secured thereto a frame that carries the gearing that is connected with the drill-rod and by means of which the said rod is rotated. It is important that this gearing not only be rmly connected with the boxing so that it will notV be apt to become disconnected therefrom or loose thereon during the comparatively hard usage to which thetool as a whole is subjected to, but the connection of such parts should be such as to permit a. uick and easy removal of the gearing in order to open the boxing for the removal therefrom of the drill-rod, or otherwise.

Set-screws, keys attached by a chain, and

other means for effecting the necessary movable connection of the gearing and boxing have been and are being employed, but they are objectionable for various reasons among which may be enumerated the liability of loss ofthe locking means, 'time required for eifecting a locking or unlocking, an accidenai loosening of the boia of the locking member, (as in the case of a set-screw) and, in some cases, the cost of construction. It is my object to provide a simple and inexpensive construction that will overcome the objections above noted, and I accomplish it by the construction and arrangement 'of parts shown in the drawin and hereinafter particularly described. That which I believe to be new will .be set forth in the claims.

In the drawing, Y

Fig. 1 a view partly in elevation `and partly in vertical section showing a vdrillrod boxing and the usual gearing carried thereby, said parts being held together by my improvements;

wlig. 2 is a perspective view portion of the boxing with one of the members of which is formed the key-engaging recessed lug; i

Fig. 3 isA the rotatable locking key;

Fig. t is a detail showing in elevationthe upper end portion of the boxing and a portion of the gearing carried thereby, with the locking key in position for holding said parts secured together; and p f Fig. 5 is a cross-section taken substantially on the line 5 5 of Fig. 1.

Referring to the drawing, 6 7 indicate the two semi-cylindrical members of a yboxing which are interio-rly threaded,v as usual, tovreceive an ordinary screw-threaded drilling bar. The two semi-cylindrical members are hinged together, and in the construction shown each member is provided with alined apertured ears through which a 'pivot pin 8 passes. In the construction shown the ears on one member are indicated by 9, 9a and 9b, while the ears on the other Amember are indicated by 10 and 10a. As-usualtlze boxing will be furnished with `trunnions upon which the device is mountedvon a suitable support, as usual. One of such trunnions 11 ispreferably formed with the ear 9- while the other trunnion 12, in the construction shown, is preferably formed integral with a part 13 that projects from the same member of the vboxing that carries-r the ear 9?, such part 13 formincr a portion of a locking means for holding t e two members of the upper il of the 'boxing in operative position. The i other principal member o-f the said locking meansv is a pivoted lever 1a carriedby the other one of the boxing members. v The locking means referred to are such as form ther subject-matter of LettersPatent No. 1,148,- 313, dated July 27, 191,5, granted upon .my application, and inasmuch as such meansv in and by themselves form no partA of my present invention, a detailed description thereof is omitted.

15 indicates a gear-carrying frame. It comprises two sleeves aty right angles to each other, one of which, 16, fits snugly over the upper end portion of the two-part boxing 6 7, and receives'in its upperportion the hub 17 of'a large bevel gear 18. The other sleeve referred to is indicated by 19, and it forms a bearing fora shaft 2() thatat its inner end has aiiixed thereto another bevel gear indicated by 21 which is in mesh with the gear 18. The shaft 2O will be shaped on its outer end so as to receive the usual device for applying power. The hub portion of the gear 17 will be provided, as usual, with ribs, one of which is shown in Fig. 1 at 22, which ribs will engage complementary grooves in the drill-rod, so as to turn such rod with the turning of the gear-all as is well understood.

At that side of the boxing opposite the hinging is provided a lug 23 which, as best shown in Fig. 2, is formed integral with one of the boxing members-the member 7 in the construction shown-such lug being located so that one of its faces is flush with the adjacent edge of the boxing member with which it is formed. In the outer edge of this lug is formed a curved recess 24. Projecting laterally from the sleeve member 16 that lits over the upper part of the boxing, and preferably formed integral therewith, is an extension 25 which is so hollowed or cored out as to form a housing for a locking member hereinafter referred to, and it has formed in its lower wall a rectangular opening 26- which is also continued, as clearly shown in Fig. 5, as a slot through the wall of the sleeve 16-of a size and shape to permit the passage therethrough of the projection 23 on the boxing when the sleeve 16 is being moved down into position on the boxing. The locking member referred to is a short cylindrical bolt 27 that is journaled in the side walls of the hollow extension or housing 25 and secured therein in any appropriate manner that will not interfere with a rocking thereof, As shown, this bolt between its ends is cut away to form a large notch 28, such notch being deep enough so that the bolt will offer no obstruction to the movement of the projection 23 when the gear-holding member is being placed upon or removed from the boxing. rlhe cylindrical portion of the bolt 27 that is opposite the portion that has the notch therein is adapted, however, in the locking position of the bolt, to just fit within the correspondingly shaped recess 24 in the edge of the projection 23, and, therefore, will effectually interlock with such part 23 when the bolt is turned as in Fig. 1, and will, of course, while in that position, hold the gear-holding frame and boxing firmly together. For rocking the bolt 27 into or out of locking position I provide it at one of its ends with a handle 29 which, as best shown in Fig. 3, is bent and provided at its outer end with a knob 29a. By having the handlA bent downward, and by having its outer end weighted, it tends by gravity to keep the bolt turned so that its locking portion will lie within the groove 241, thus lessening the chances of the bolt becoming accidentally turned into a position that would break the locking engagement referred to. 30 indicates a stop projecting from that face of the housing 25 adjacent to the operating handle 29, and formed on the surface of the end portion of the bolt that projects out of the housing 25 is another stop member 31 of such size as to limit the rotation of the bolt to an arc of approximately one hundred and eighty degrees, so that when the bolt is rotated to the limit of its movement in either direction, it will be either in full locking position or in position to allow of the separation of the gear-holding frame and the boxing.

By my invention l have provided a locking mechanism that is very simple and inexpensive, and not liable to allow of the accidental separation of the two principal parts referred to, and which, when in locking position, will very securely hold such parts togather.

What l claim as my invention and desire to secure by Letters Patent, is-

1. In a device of the class described, the combination with two separable boxing members adapted when closed together to rotatably support a drill, one of said boxing members having a lateral projection thereon, of a gear-carrying sleeve surround.- ing the upper portion of said boxing and slotted to receive said projection, said sleeve also having a lateral projection, the two said projections lying close together, and a member movably mounted on one of said vprojections and adapted to interlock with the other projection.

2. In a device of the class described, the combination with two separable boxing members adapted when closed together to rotatably support a drill, one of said boxing` members having a lateral projection thereon, of a gear-carrying sleeve surrounding the upper portion of said boxing and slotted to receive said projection, a housing carried by said sleeve opposite the slot therein, through which slot and into said housing` said projection extends, and a rotatable bolt journalled in said housing adapted in one adjusted position to interlock with said projection and im another position to be clear thereof.

3. In a device of the class described, the combination with two separable boxing members adapted when closed together to rotatably support a drill, one of said boxing members having a lateral projection thereon, of a gear-carrying sleeve surrounding the upper portion of said boxing and slotted to receive said projection, a housing carried by said sleeve opposite the slot therein, through which Slot and into said housing said projection extends, a rotatable bolt. journaled in said housing adapted in roo one adjusted position to interlock with said projection and in another position to be clear thereof, and means for stopping the rotation of the bolt When it has reached either of such adjusted positions.

4. In a device of the class described, the combination with two separable boxing members adapted when closed together to rotatably support a drill, one of said boxing i members having a lateral projection thereon, of a gear-carrying sleeve surrounding the upper portion of said boxing and slotted to receive said projection, a housing carried by said sleeve opposite the slot therein, through Which slot and into said housing said projection extends, a rotatable bolt journaled in said housing adapted in one adjusted position to interlock With said projection and in another position to be clear thereof, and a bent handle connected With said bolt normally tending by gravity to 20 hold said bolt in locking position.

5( In a device of the class described, the combination with tWo separable boxing members adapted when closed together to rotatably support a drill, one of said boxing members having a lateral projection thereon provided With a curved recess in the edge thereof, of a gear-carrying sleeve surrounding the upper end portion of said boxing and having a slot in the Wall thereof to receive said projection, a rotatable bolt carried by said sleeve atapproximately right angles to the axis of the sleeve, said bolt being adapted in one position to Which it may be rotated to lie Within said recess to lock said boxing and sleeve together and having a notch in one side to prevent such locking engagement When rotated into another position.

JOHN A. HALLANDER. 

